Hi, I am wanting to use some of my old pages in guides on the new site here and cannot seem to figure out an easy way to copy-paste my HTML pages into guides.

What I would like to be able to do it just copy the source from my original page to a guide here. I have a bit of html code that sets tables and various colors. I might be able to replicate this manually by basically re-writing the page but would prefer not to have to do this.

Is there a way when creating a guide to use html in the body of the document?

For a guide: no.

For this, you'll have to create a menu item and place the text in the body there (remembering to check the box for "HTML Enabled").

--
It's all in the reflexes.